Using obstacles to funnel an attacking force

The position is arranged like a siege camp, with troops pulled back from the outer defences. Attackers climbing those obstacles become more exposed to artillery, while the inner line provides the real protection. The outer belt funnels the advance into predictable approaches and releases much of the infantry as a mobile reserve. An exposed unit then moves behind the lee of a hill, where it remains a threat without giving the opposing artillery a clear target. The enemy commits too many troops to that distraction and reaches the decisive sector with inferior numbers. The fieldworks direct the enemy's movement while preserving the defender's freedom to manoeuvre.